RFR: 8365199: Use a set instead of a list as the intermediary Klass* storage to reduce typeset processing [v6]

[Markus Grönlund]

> Greetings,
> 
> This change set is a performance improvement to speed up JFR typeset processing.
> 
> It accomplishes this by using a set instead of a list as the intermediary Klass* storage.
> 
> Further, the existing JfrSet implementation (currently backed by a linked-list ResizeableResourceHashTable) is optimized to use instead a slimmed open-addressing implementation, premised on the invariant that our sets are key sets. 
> 
> Running the test program attached to the JIRA issue results in a 100% performance improvement in total running time (by reducing the work set of Klass: es being processed by the JFR Recorder Thread).
> 
> Testing: jdk_jfr, stress tests
> 
> Thanks
> Markus

Markus Grönlund has updated the pull request incrementally with three additional commits since the last revision:

 - merge error
 - Merge branch '8365199' of github.com:mgronlun/jdk into 8365199
 - use load factor instead of probe sequence

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/26733/files
  - new: https://git.openjdk.org/jdk/pull/26733/files/9b9db9f2..07d9d1ab

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26733&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26733&range=04-05

  Stats: 89 lines in 5 files changed: 32 ins; 23 del; 34 mod
  Patch: https://git.openjdk.org/jdk/pull/26733.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26733/head:pull/26733

PR: https://git.openjdk.org/jdk/pull/26733